Setting of dental polyelectrolyte cements-viscosity studies of model systems

✍ Scribed by Cook, Wayne D.

• Publisher: John Wiley and Sons
• Year: 1983
• Tongue: English
• Weight: 444 KB
• Volume: 17
• Category: Article
• ISSN: 0021-9304
• DOI: 10.1002/jbm.820170207

✦ Synopsis

Setting of dental polyelectrolyte cementsviscosity studies of model systems

In order to gain information on the setting ot dental cements, the influence of Ca'+, Mg'+, Zn2+, and A13+ ions on the viscosity 0 1 concentrated solutions of partly neutralized pol!r(carboxylic acids) has been measured. The increase in viscosity with increasing cation concentraiion was semiquantitatively interpreted in terms of chain growth and branching due to intermolecular bridging of the carboxylate groups by the metal ions. The concentration of cation required to produce gelation was considerably greater than expected and may be due to the wastage of cations by the formation of intramolecular links. The incorporation of tartrate ion into the polyacid solution retarded the reaction between A13+ and the polyacid and may explain some features of the setting of glass ionomer cements.